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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb505cebd49fc08594f07ec9f4e56d362756480a9ee0eb1b992017a3b700c98' 
  AND token = 'cfESesQNnLKbZ1J0q4ZvQO+ylNg383KU6u30QV9w9nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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