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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84fab84375c8bddd9e80e840ec736d8018893ecb1e298e058f05ff51ee2822fa' 
  AND token = '/cI+U7blvMFnLYOdGS6PAuU4Z14rW8NvoKuXp1A316A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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