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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b28e38636e5ab538c60eb0c24c7727514e175842c2d1065b130ae93b00c2b40' 
  AND token = 'Y2cLpgS1HOiU7oFEWBrgtVf/MqHvemVdpxFlApJ223g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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