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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d558f955c4b1112520524d6bec9ef1a2ce74d6ab8ef8f860dfa7bb598ae7b1' 
  AND token = 'Wz9CCdkfimCF8kY3q+rKwX6ud9+LKTNzacbm3mGaDjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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