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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2c1241eaf6c205a7519f33ad9c64f81e8e9d6b6acc2fe159a227d0f70a9dcb' 
  AND token = 'q/+j664sBEUEUsb7xhifbP2yHwxj+JVSya6YqjtEtqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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