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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc80d746166939d80538f41b6947ae4b96073446299faf2935141f8ff619e84b' 
  AND token = 'pRG3PM6uY9bIRLSkJGaL4LU8kBJnfKzf1VnOWeBCTr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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