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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0060df6583bc4c53759e189a8c304b7fedc0e7d1ba362af1eecc816b29a5310d' 
  AND token = 'Yh8Z26/+obHEtYkjBpVnNmy255ej360Ngsq/Lk+Pe68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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