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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d719b8697a0031aba5d298136781424ab867853bff5a6b20605732e7dc7449d' 
  AND token = 'tINVEXZ3vIrggh+RVo1ZtrLzA9bCGbQZP0krCAt8mYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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