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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac1ef5e0b3f41ed8b54e3e02ec8b0aa834e35fcd4fecadcc91130d56beb95d8' 
  AND token = 'r6mQvSKVDCV3U3PMk5p59WKz43ScEc5hhpEIEU6rI8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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