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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05aab02f4d31655d962692ed7d4f3c8f7037c8c575a268137c0271239329eeb2' 
  AND token = 'eGYbtkH9Of6EtwwMsTISJRefr1Ova5MVWjzkTsFnLv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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