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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af62e62de9fa51bfafb494472c1017ccd3dcce9d49d34a66cfbcae9889d506cb' 
  AND token = 'rIeIgr5zOaIx901WX6WmSBHljNWD7obLKgLckRhH2bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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