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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30f93a47e2d63c5f82d4be431c6b5cb1b7b9e2574a90b13176cc3afbed167a5' 
  AND token = 'AqtGtgt3X3c2/aviqrPwf4Obi7YsbSNiYAIyoFYFF0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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