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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17002ceb46ad8044b2175f50e80b1db16891d668a0af915c73b570415e212891' 
  AND token = 'NxdIzmD9oyC0QhHRbLuihByn4tk1rfx7HrUffnXLaK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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