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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb84069692ebbc3dadea16325f5c01bd8122cf6c432780428388eaf9e77ce97' 
  AND token = 'KlO+s3M3zLibzbMfySWIbnXgIVIELj7pCAjW5i3bqa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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