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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2edc3f055efeb479ee00428fbcb54c53e1a6da0bd846000f779f9199f5e6de40' 
  AND token = 'Y27XoLilPLQSzBegPPpFbt4LSXKHbCl/GeB3nH7hjPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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