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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb443fee596880082cf80c724b183f053a597a041a12489c71db8ea1a897b0b7' 
  AND token = 'fGSNW6ec81RGels4U5rMZ+mlvMsbmoZPtGCu4g7npe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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