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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f258cfc8c114ae1502f9b6df5429555054cdb8edd44b5ce962a09a369dcde95f' 
  AND token = 'U7zOlfrVs4M8rxMyNn8KShUTrGVToZgVrHsSslt5nZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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