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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '001a6d76bf505b7715ce4811066aae6d66086e98fc3a840abb05df81c45baa97' 
  AND token = 'OuaAsgJhl56J4Lur8OHHXChvHnBnOhYO75VhQlcDbrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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