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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36982f02249aa0313b5a2519d3cddf6a79b20d3755bd40e6fb01e5b9ea9ed87d' 
  AND token = '8sNqIAinZi9t9doPfU1sB/XrnOsw4lJrOCsahak8fQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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