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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3dd7897cc976553b2649c3f59206acabe9425ad396412277769943c75e9e23' 
  AND token = 't3dTksE/qkNROsBBIlTupouwtA98x35zxAAk2zNoxlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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