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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd159b2d144443e39edbe0eb1768cdee97486968d0f7dce278ba4f43aff626677' 
  AND token = 'uE63T+t0Ah1+CQ4NJ/Jxz/YHWfugr10PhSEad8yNfaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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