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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba974eadf05f2e10c2068a92bb164a66078a914e48f277b851b452d71bbbf05b' 
  AND token = 'GPRt4dL/+FrwmW6xfeYiLD3Xzp0cdCxFx0MfUWf5ZWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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