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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e18d6d2b89be154167d4e70bab4fc4665121740b115d93991b299ff84074118' 
  AND token = 'oaNT1scJYM5DGjFhPs5XJVp2AXcsmIJVIoKsLeu8wTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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