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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05e90abf339e60db7967e15c9e9626c58effee3e9bb6945fa19f530329ff965d' 
  AND token = 'H2nJO4rmlPD+8Kb90kRCKfPNQ9SWE1WWADJQnAACVIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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