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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db2e4382d27d1332976aef687d66e129db35a8f6dedd55c6bfd1238b9710ac9a' 
  AND token = 'u2zzvZ1o9OqUlQ10CSx3Lnjtwy1RzLmiT7rcxGqj/qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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