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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa5b174be6d8fd0b0eb1d50632714d55e4069a67f125cdd7883c900bcf31c0ce' 
  AND token = 'U31lmwsT+eBoyEobaUbnbxyW23af9hlRbOSZ+ktYiFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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