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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e28618aa618e4f474feed40e1a2534f14191a68e2ea457d01cb2a9402031be7' 
  AND token = 'T+wrOzxa284pMcUqx+KbLvtrd1v6CdgQhLu74I+wk6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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