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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22fcaf3667ee5d79eed41b9680b70db2db4c28ac9fee39ac0b1208cafef4f55a' 
  AND token = '87+5vl8e1+lKBgQpKsYuzKCIyF4MEXCGkRKQWSueHrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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