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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0b0d90292c531bcf26fb331f114bf3d17bbab8b0a10ac7c4cce821586203f3' 
  AND token = 'eF9yEsh+0gz5L1xrnz01x85JPyHBft1pzTmRY3gXeXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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