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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f8f435bf053ee91784452cbc4c31caee1510a57ec2ae4147f7c1ff1aa7d10c' 
  AND token = 'abB3HrBwUbkw0DFefKoPwlgZm+uwo1hcUUhqIEX16Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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