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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f36a3bdfa221e7aeae06044a62e4a08934333b773df1dd496ab9bc2c55752c8' 
  AND token = 'cT5L7+MSy+jHAvKLArV2thCO9+Zft0FRq7cvBlsACAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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