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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8319c4675b2a4a202adaa0b84aa940a45818b4037e6857f29f3cbb9fe561c84b' 
  AND token = 'ogCSKi/Eod6Gnrut/1GtI1yhSusaHtzsq6rEioMd2XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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