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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf1a738f0194e27dbbae64e7a07f081c3697e37ab0b7df5ad17b6cc1f351e7d' 
  AND token = 'Xig1NhnrYHC+v3+42ouZFFmaFNmx+uL1k4Vvto4dlyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}