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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f11e6f23b2b13a620a4f16e774c7e876f849a76a6609ed07211ab63bdfc399' 
  AND token = 'nXoJqVMMlNgjansXGen+Sg+DOO/+eQgwnqA3G9Ak0UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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