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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e7c454c9743786338f4048dbb7bf53333af8eba13dc3cd9ed08798fb046d90b' 
  AND token = 'W9zc8FR78VAUsNQi+tYbG+3dd/eK/bncMiC9uqJuxcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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