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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19061c74bc5ca511d3b05c1ad49e9e0b76837d5f56c82553e03f168cec58a8f3' 
  AND token = '0yOJh6N/68f8zYp520yFjbZIEOR6uJ8SxcWrR4s941s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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