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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71b4187d0dc55b80ffb72ba79e95a4f0f2620d3cb5e4b9ef5f486c860948c54' 
  AND token = 'mxYqq2Ecf/6CwyWwcWfCy/RvgIlBcNyAO+LdBJCbl+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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