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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11b12ba13ba5827b2ceb96aa4f69c5cf8b262f3a6545223f771832f5c55ca54' 
  AND token = 'WEvBYjyTexLLCRKsmzCpY9srAaA/FdFL+87NYxNEaZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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