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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad91a11fbcd25567b05e7dbdb5fff9ccc0db4d2f3af4e8f9740501fa8e21ebe1' 
  AND token = 'UInwYvhvSnu6pSfPPurmj13huG7cOWNqjLpi1W/IgOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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