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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4cd044a1f6b1db8b569c6a8cf82a05eaf0787d0dd8c0de30e9eb2e3f00a1051' 
  AND token = 'omZ+9yCNoOwX/QhD3dotiqXQZV5hklecctyy88KKOmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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