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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0430a20fa26198f85282d2483d46910983790ffa301156e7fc041fea17bc67b6' 
  AND token = 'RDXGjEXo/L35KUr3P96cuj9ocFGKRKg8OSkdvkOfRhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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