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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db8be14aa117e8361aefe4b0f1ec5da589c89f8f17edc99a857a39b4288b4fa6' 
  AND token = 'tEX4g+B2dH30h3qIW4rVnaiuSLMWFwlPEm40bb3DZBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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