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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e447709dec8fd5deb7748ebe82c69f2fba8450d0a9d042370c4cddf0bcc2705e' 
  AND token = 'YNc9DsSxANkOF+YESnWv+TtpbXmvwEg0hO9IlizwKYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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