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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2faabdcf832ab98df561f65a687ad4223997359142e5c0a53015b49da40047fb' 
  AND token = 'RrxcU/iJaeXZ6Pagj/Gr1OSb1T6wgiNMJWV81tsMMuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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