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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c32ba28253ed7fa37d12eb63bd736973178f9408e1687b9b3b6685f755c69f9' 
  AND token = 'Gzl20Q1pmaN8Ht7CAvoS+bxkwhYCCDQ+tadi0URnFmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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