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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b12426cf3dca2f61ab1b959cce6c72e55b129967647c0c06a8f259744cb72e' 
  AND token = '3zUwohoIoJ2+XPdfxyoSiyBw0RNUslQUVq3SdEq7GQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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