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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85cd08c361f49b41d1a60e85382b5f64dd9b814d0c36ae8ca09cb699a4eb109d' 
  AND token = 'nw34Ba47Z/ML8Lh7W3U5jPbuJ8VAEG6PfhO+yz6ERwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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