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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd329fe5928e576ceec1f558ae7c56a205880389f83fbbcbcfb7c33bb660f577b' 
  AND token = '8uxx67m9+uJ+UnQj4Q2LhawENTCWToNpf6CyoToFUK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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