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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e8524c76a1a57672bef7a8b782d16b4d0373f8ea77081df2be923a9ec1aa8b1' 
  AND token = '4lQovXRcpX+Af1oW5VSkCZjP05FnFd90rtPtEKjD7aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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