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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fabc8a82cffbccf7fb74f35c61d10711c30aa75f2df97b691698b0d600ef6f72' 
  AND token = 'B3DiMCBOpUn6KFZDAzpk+m6/ptxAtN2QiYYYxw6jW7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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