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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0e57ee5d674acdd0b1fd78b1d1ad0714f01848c703c6f9f8a5b05655150083' 
  AND token = 'bOfNMosuyuwj7Zf7CQv3DZ1ZNrfJNO+kmxXDHKiaeC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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