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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba465bbfc35fffefe94b135b0dd58384360ca2af88f6c18ebde00a2a596ad0c0' 
  AND token = 'fCeeEo76TDr4OyGCOPE8qXMLainWCxOb0chqXms2xSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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