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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e1e734a5c92bb9999edff33094bc6c493862b737c64c732812cc25511e04768' 
  AND token = 'D0LzPac8EQzKu2lHJdyysOZGVOGoei3fJI5L12hc4xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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