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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d24faedd865384b0567abfdfe43e82120a2ad22b036b55c70d5751a8a93488' 
  AND token = 'St/037ZoMecSyobb/nqP6b5Teu55QZxH0wvQOeKI9q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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