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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f1bc6520f534f31fca26c0c0b19e24eaebc99db1a93dadefa4584bb28a6d981' 
  AND token = 'r97SSfysbM1lfsXxdX2XrAfAjLDobsg6dp3WWJzg7kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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