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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20b0b9d6e1254dfacace1b49a0b20d9f0cfe4cdbb6ec111b6878b2a76d3f359a' 
  AND token = 'sZG9EM58mRk2sBZKXmlSlJLA4ZIlY7J/qUFUD+kxClE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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