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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb7f889bd1756fedfd5eb762cf7d857c21fbca45d8d7ca5f39cb752b383bfe2' 
  AND token = 'D96WLJrzvPpu48/e94e1a6LHFJi/PbMKzcDBL0dn/1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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