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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fbce2933811ca30b34c272311e9bce53991fc8860fa56c3b30df3afddd5acfe' 
  AND token = '5m5ZayDGjs/XN/zbEOp0IH32XTXwYEslzCE1/GdHuL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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