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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6b4d3c06d973e6c8c7d2aded287031b46f56a35892a48e6177f3bde7f5fd92' 
  AND token = 'R/kwjHX9t0Qb5UXZ+aOKi5T+bJ5Sdo9jwwZSCV/cOr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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