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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4c8ef3c091f2c62cfaff5e15a52b6b05bda28fc7381a1674965ad5af3db8db' 
  AND token = '9mWYgIj/W3l/CxH9PXHIfm0AMZSAiKTxx+B2DenubCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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