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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe6d16670d09faae1feb74292bea79307a307924d33dde6a86ce8a95ce0abdd' 
  AND token = 'QIHzq881i/9HtD88yyaYl9EbO56EU+gAHl6wYysD94Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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