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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ce0c863aae234340450f4ffee2522c7b3ba685a741564075e0e6f5ad8836872' 
  AND token = '/MhmKHsbSp3T8QLEcT0899yF/EJGJVO64cZsG+YVUEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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