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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5aa7385c96b9abf0f6c9a3bea9096c9a8fbd55cdc9ca546d186f59fb315cffe' 
  AND token = 'A0/1sdB53L9ud6rqSpiOa44oW/X8ZCXBtFxVi6UdelU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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